نتایج جستجو برای: تکنیک saw
تعداد نتایج: 46105 فیلتر نتایج به سال:
Surface Acoustic Wave (SAW) filters are small, rugged and cost-competitive mechanical band-pass filters with amazing frequency response characteristics. Therefore, SAW filters have played an important role as a key device in various mobile and wireless communication systems such as personal digital assistants (PDAs) and cellular phones (Campbell, 1998). Recently, the balanced SAW filter becomes...
امروزه گردشگری یکی از مهمترین، پرسودترین و امیدبخشترین فعالیتهای انسان معاصر است، به گونهای که از آن به عنوان گذرگاه رشد و توسعه یاد میکنند. در بسیاری از کشورهای دنیا امروزه صنعت گردشگری نیروی اصلی پیشبرد و توسعه اقتصادی به شمار میرود و به اندازهای در رشد اقتصادی- اجتماعی کشورها اهمیت دارد که بسیاری از برنامهریزان و اقتصاددانان آن را صادرات نامرئی نامیدهاند. پس باید به ظرفیت فضاهای گرد...
A new surface acoustic wave (SAW)-based rate sensor pattern incorporating metallic dot arrays was developed in this paper. Two parallel SAW delay lines with a reverse direction and an operation frequency of 80 MHz on a same X-112°Y LiTaO3 wafer are fabricated as the feedback of two SAW oscillators, and mixed oscillation frequency was used to characterize the external rotation. To enhance the Co...
We consider a model of dynamical neutrino masses via the see-saw mechanism. Nambu-Goldstone bosons (majorons) arise associated with the formation of the heavy right-handed majorana masses. These bosons then acquire naturally soft masses (become pNGB’s) at loop level via the Higgs-Yukawa mass terms. These models, like the original neutrino pNGB quintessence schemes of the 1980’s [1, 2] that proc...
پارکهای ملی نقشی اساسی در حفاظت اکوسیستمهای طبیعی در سطح ملی و جهانی دارد از اینرو تعیین و اولویتبندی معیارها و شاخصهای اکولوژیکی، اقتصادی و اجتماعی جهت ارزیابی پارکهای ملی حائز اهمیت فراوان میباشد. لذا در این مقاله، از پرسشنامههای دلفی به منظور شناسایی معیارها و شاخصهای اکولوژیکی، اقتصادی و اجتماعی حایز اهمیت در ارزیابی پارکهای ملی و از تکنیک آنتروپی به منظور محاسبه وزن آنها استفاده ...
We demonstrate that 18-month-olds, but not 14-month-olds, can anticipate others' actions based on an interpretation of shared goals that bind together individual actions into a collaborative sequence. After viewing a sequence of actions performed by two people who socially interact, 18-month-olds bound together the socially engaged actors' actions such that they later expected the actors to sha...
Accurate sawing requires attention to proper alignment and maintenance. Alignment is critical to modern sawmills using thin kerf saws. In fact, the improvements in machine design were critical to the development of thin kerf sawing systems. About two-thirds of sawing problems are caused by misalignment, not saw preparation. Good alignment reduces down-time and machinery wear and should be part ...
In this paper we continue study on the Stepwise Adaptation of Weights (saw) technique. Previous studies on constraint satisfaction and data classification have indicated that saw is a promising technique to boost the performance of evolutionary algorithms. Here we use saw to boost performance of a genetic programming algorithm on simple symbolic regression problems. We measure the performance o...
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